Liquid crystal composition having good photostability and thermostability, and liquid crystal display element

ABSTRACT

A liquid crystal composition having good photostability and thermostability. The liquid crystal composition comprises: 5-30% of one or more compounds of general formula I based on the total weight of the liquid crystal composition; 1-30% of one or more compounds of general formula II based on the total weight of the liquid crystal composition; 1-30% of one or more compounds of general formula III based on the total weight of the liquid crystal composition; 1-20% of one or more compounds of general formula IV-1 and/or general formula IV-2 based on the total weight of the liquid crystal composition; and 15-50% of one or more compounds of general formula V based on the total weight of the liquid crystal composition. A liquid crystal display element containing the liquid crystal composition is also provided.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a liquid crystal composition and aliquid crystal display element, and more particularly, to a liquidcrystal composition having good photostability and thermostability, anduse of the liquid crystal composition in a liquid crystal displayelement.

Description of Related Art

Currently, liquid crystal compounds become more widely used, and areapplicable to many types of displays, electro-optic devices, sensors,etc. A wide variety of liquid crystal compounds are available for theabove fields, in which nematic liquid crystal compounds is the mostwidely used. For example, nematic liquid crystal compounds have beenapplied in passive TN or STN matrix displays and a system with a TFTactive matrix.

For TFT-LCD application field, the market has enjoyed tremendous growthand the technology has become more mature; however, the demands fordisplay techniques are rising, especially in terms of high responsespeed and low drive voltage to reduce power consumption. A liquidcrystal material, as one of important optoelectronic materials, plays animportant role in improving the performance of a liquid crystal display.

A liquid crystal material is required to have good photostability andthermostability. A liquid crystal material for use in TFT-LCD is alsorequired to have a high nematic-phase upper temperature limit, a highdielectric anisotropy, good anti-UV properties, and a high voltageholding ratio and the like, in addition to the forgoing stability.

In dynamic image display application, the liquid crystal is required tohave a high response speed in order to eliminate afterimages andtrailing in image display. As a result, the liquid crystal is requiredto have a low viscosity. In addition, the drive voltage of the liquidcrystal are desired to be as low as possible in order to reduce powerconsumption of the device.

To achieve high quality display, high contrast is another importantperformance parameter of a liquid crystal display. Contrast is inpractice a ratio in brightness, and a liquid crystal composition havinga high optical anisotropy can increase the contrast of a liquid crystaldisplay element.

In the related art, there is a problem in which a good compromisebetween a low viscosity, a suitable optical anisotropy, a suitabledielectric anisotropy, a high response speed, a low drive voltage of aliquid crystal composition cannot be achieved, so that performanceindicators of, for example, LCD TVs and tablet PCs cannot be met. Thus,it is required that a liquid crystal composition must have a highclearing point, a low viscosity, good photostability andthermostability, a large dielectric anisotropy, a large opticalanisotropy, and good compatibility between liquid crystal compounds.

Any liquid crystal compositions for display are required to have a wideliquid crystal-phase temperature range, a high stability, a lowviscosity, and a fast response speed for an electric field. However, noliquid crystal monomer has been used alone in a liquid crystal displayso far, so as to satisfy the performance requirements withoutcombination with other compounds.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a liquid crystalcomposition which has a large dielectric anisotropy, a large opticalanisotropy, a high clearing point, a low viscosity, and goodphotostability and thermostability simultaneously.

To achieve the above object of the present invention, the presentinvention provides a liquid crystal composition having goodphotostability and thermostability, comprising:

5-30% of one or more compounds of general formula I based on the totalweight of the liquid crystal composition

1-30% of one or more compounds of general formula II based on the totalweight of the liquid crystal composition

1-30% of one or more compounds of general formula III based on the totalweight of the liquid crystal composition

1-20% of one or more compounds of general formula IV-1 and/or IV-2 basedon the total weight of the liquid crystal composition

and

15-50% of one or more compounds of general formula V based on the totalweight of the liquid crystal composition

wherein,

R₁, R₂, R₃, R₄, R₅, R₆, R₇, and R₈ are the same or different and areeach independently selected from a halogenated or non-halogenated alkylor alkoxy group having 1 to 10 carbon atoms or a halogenated ornon-halogenated alkenyl or alkenyloxy group having 2 to 10 carbon atoms;

L₁ is —H, —F, —Cl, or —CH₃;

Z₁ is a single bond, —COO—, or —OCO—;

X₁ is —H or —CH₃.

In some embodiments of the present invention, R₁, R₂, R₃, R₄, R₅, R₆,R₇, and R₈ are the same or different and are each independently selectedfrom a halogenated or non-halogenated alkyl or alkoxy group having 1 to5 carbon atoms or a halogenated or non-halogenated alkenyl or alkenyloxygroup having 2 to 6 carbon atoms.

In some embodiments of the present invention, L₁ is —H or —F.

In some embodiments of the present invention, Z₁ is a single bond or—COO.

In some embodiments of the present invention, R₁, R₂, R₃, R₄, R₅, R₆,R₇, and R₈ are the same or different and are each independently selectedfrom an alkyl group having 1 to 5 carbon atoms.

In some embodiments of the present invention, L₁ is —H.

In some embodiments of the present invention, Z₁ is —COO—.

In some embodiments of the present invention, the liquid crystalcomposition further comprises:

0-10% of one or more compounds of general formula VI based on the totalweight of the liquid crystal composition:

wherein,

R₉ is selected from an alkyl or alkoxy group having 1 to 10 carbon atomsor an alkenyl or alkenyloxy group having 2 to 10 carbon atoms;

X₂ is selected from —F, —OCF₃, an alkyl or alkoxy group having 1 to 5carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6 carbonatoms;

ring

is

In some embodiments of the present invention, R₉ is selected from analkyl group having 1 to 10 carbon atoms.

In some embodiments of the present invention, X₂ is —F.

In some embodiments of the present invention, ring

is

In some embodiments of the present invention, the liquid crystalcomposition further comprises:

0-30% of one or more compounds of general formula VII based on the totalweight of the liquid crystal composition:

wherein,

R₁₀ is selected from an alkyl or alkoxy group having 1 to 10 carbonatoms or an alkenyl or alkenyloxy group having 2 to 10 carbon atoms;

ring

are the same or different and are each independently selected from

In embodiments of the present invention, the compound of general formulaI comprises 10-25% of the total weight of the liquid crystalcomposition; the compound of general formula II comprises 5-25% of thetotal weight of the liquid crystal composition; the compound of generalformula III comprises 5-25% of the total weight of the liquid crystalcomposition; the compound of general formula IV-1 and/or IV-2 comprises1-10% of the total weight of the liquid crystal composition; thecompound of general formula V comprises 20-45% of the total weight ofthe liquid crystal composition; the compound of general formula VIcomprises 0-10% of the total weight of the liquid crystal composition;and the compound of general formula VI comprises 0-30% of the totalweight of the liquid crystal composition.

In some embodiments of the present invention, the compound of generalformula I is selected from compounds I-1 to I-5:

In some embodiments of the present invention, the compound of generalformula II is selected from compounds II-1 to II-5:

In some embodiments of the present invention, the compound of generalformula III is selected from compounds III-1 to III-5:

In some embodiments of the present invention, the compound of generalformula IV-1 is selected from compounds IV-1-1 to IV-1-10:

In some embodiments of the present invention, the compound of generalformula IV-2 is selected from compounds IV-2-1 to IV-2-10:

In some embodiments of the present invention, the compound of generalformula V is selected from compounds V-1 to V-6:

In some embodiments of the present invention, the compound of generalformula VI is selected from compounds VI-1 to VI-10:

In some embodiments of the present invention, the compound of generalformula VII is selected from compounds VII-1 to VII-2:

wherein,

R₁₀ is selected from an alkyl or alkoxy group having 1 to 5 carbon atomsor an alkenyl or alkenyloxy group having 2 to 6 carbon atoms.

In some embodiments of the present invention, R₁₀ is selected from analkyl group having 1 to 5 carbon atoms.

In some embodiments of the present invention, the compound of generalformula VII-1 is selected from compounds VII-1-1 to VII-1-5:

In some embodiments of the present invention, the compound of generalformula VII-2 is selected from compounds VII-2-1 to VII-2-5:

The liquid crystal composition of the present invention does notcomprises a compound of general formula VIII:

wherein,

R is selected from a halogenated or non-halogenated alkyl or alkoxygroup having 1 to 10 carbon atoms or a halogenated or non-halogenatedalkenyl or alkenyloxy group having 2 to 10 carbon atoms.

Also provided is a liquid crystal display element containing the liquidcrystal composition.

Compared with the prior art, the liquid crystal composition of thepresent invention has better photostability and thermostability, a largedielectric anisotropy, a lower viscosity, a higher clearing point, andan appropriately high optical anisotropy, and is suitable for use in aliquid crystal display element.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will be described below in connection withspecific embodiments. It is noted that the following examples are merelyillustrative of the invention and are not intended to be limiting. Othercombinations and various modifications can be made based on the conceptof the invention without departing from the spirit or scope of theinvention.

For convenience of expression, in the following examples, the groupstructures of the liquid crystal composition are represented by codeslisted in Table 1:

TABLE 1 Codes for group structures in liquid crystal compounds Unitstructure of the group Code Name of the group

C 1,4-cyclohexylene

P 1,4-phenylene

D 1,4-dioxanyl

U 2,5-difluoro-1,4-phenylene —CN N Cyano —CH₂CH₂— 2 Ethylene —OCF₃ OCF₃Trifluoromethoxy —F F Fluoro substituent —O— O Oxy substituent —CF₂O— QDifluoromethyloxy —COO— E Ester linkage —CH₂O— 10 Methyleneoxy—C_(n)H_(2n+1) or —C_(m)H_(2m+1) n or m Alkyl —CH═CH— or —CH═CH₂ V Vinyl—C≡C— or —C≡CH T Ethynyl

A compound of the following formula is taken as an example:

With the codes listed in Table 1, the structural formula may beexpressed as nCCGF, in which n represents the number of C atoms of thealkyl at the left end and is, for example, “3”, indicating that thealkyl is —C₃H₇; and C represents cyclohexyl.

The test items in the following examples are abbreviated as follows:

Cp: clearing point (nematic-isotropic phase transition temperature, °C.)

Δε: dielectric anisotropy (1 KHz, 25° C.)

Δn: optical anisotropy (589 nm, 20° C.)

VHR (100° C.): voltage holding ratio after being maintained at a hightemperature of 100° C. for 1 h (%)

VHR (UV): voltage holding ratio after 20 min of irradiation by a UV lamp(%)

η: kinetic viscosity (mm²·s−¹, 25° C., unless otherwise noted)

The optical anisotropy is measured using an Abbe refractometer under asodium lamp (589 nm) as a light source at 20° C. The dielectric testcell is the type TN90, and the cell gap is 7 μm.

VHR (UV) is tested by TOY06254 liquid crystal physical propertyevaluation system, where the test cell is irradiated by a UV lamp for 20min (365 nm, 5 mW/cm²) and cooled to room temperature, the testtemperature is 25° C., and the test cycle is 166.7 ms.

VHR (100° C.) is tested using TOY06254 liquid crystal physical propertyevaluation system, where the test temperature is 100° C., and the testcycle is 166.7 ms.

Each of the components used in the following examples can be synthesizedusing a known method or using an appropriate combination of methods inorganic synthesis chemistry, by the inventors of this application. Thesesynthesis techniques are conventional and the resulting liquid crystalcompounds are tested to conform to the standards for electroniccompounds. Methods for introducing a target terminal group, a ringstructure and a binding group into a starting material are described inOrganic Syntheses, John Wiley & Sons, Inc; Organic Reactions, John Wiley& Sons, Inc; Comprehensive Organic Synthesis, Pergamon Press; NewExperimental Chemistry Course (MARUZEN CO., LTD), and otherpublications.

A liquid crystal composition is prepared according to a mixing ratio ofthe liquid crystal compositions defined in the following examples. Theliquid crystal composition is prepared by a conventional method in theart, for example, mixing according to the defined ratio by heating,ultrasonicating, and suspending, etc.

The liquid crystal compositions given in the following examples areprepared and investigated. Composition and performance test results ofeach liquid crystal composition are shown below.

Each of the liquid crystal displays used in the following embodiments isa TFT liquid crystal display device, having a cell gap of d=7 μm andincluding polarizers and electrode substrates. The display device is ina normally white mode, that is, the color of a pixel seen by a viewer iswhite when no voltage is applied across row electrodes and columnelectrodes. Upper polarizer axis and lower polarizer axis on thesubstrates are at a 90-degree angle with respect to each other. Anoptical liquid crystal material is filled into a space between the twosubstrates.

The composition, mixing ratio and test result of the liquid crystalcompositions of comparative examples when filled in two substrate of theliquid crystal display device for peformance test are listed in Tables 2and 7, for comparison in performance with the liquid crystalcompositions of the present invention.

COMPARATIVE EXAMPLE 1

The liquid crystal composition of Comparative Example 1 was preparedwith the compounds in percentages by weight shown in Table 2, filledbetween two substrates of a liquid crystal display, and subjected toperformance test. The test data is shown in the table below.

TABLE 2 Formulation of liquid crystal composition and performancestested Code of Code of Percentage Test result of component structure byweight performance parameters 3PUQUF 6 Cp 90.2 2CPUQUF 9 Δ∈ 10.2 3CPUQUF9 Δn 0.103 3C2CUF 12 η 32.8 4C2CUF 9 VHR (100° C.) 95.2% 5C2CUF 9 VHR(UV) 90.7% 3CCUF 7 4CCUF 5 3CC2UF 15 3CPUF 6 5CPUF 4 3CGUF 4 2CCCUF 23CCCUF 3 Total 100

EXAMPLE 1

The liquid crystal composition of Example 1 was prepared with thecompounds in percentages by weight shown in Table 3, filled between twosubstrates of a liquid crystal display, and subjected to performancetest. The test data is shown in the table below.

TABLE 3 Formulation of liquid crystal composition and performancestested Code of Code of Percentage Test result of component structure byweight performance parameters 3CCGF II-3 8 Cp 95.9 4CCGF II-4 7 Δ∈ 10.15CCGF II-5 5 Δn 0.105 2CCGF II-2 1 η 18 2CCPOCF3 III-2 6 VHR (100° C.)96.5% 3CCPOCF3 III-3 9 VHR (UV) 96.1% 4CCPOCF3 III-4 4 3PGUQUF I-3 6.54PGUQUF I-4 7 5PGUQUF I-5 7 2PGUQUF I-2 4 3CPPC3 IV-1-3 1.5 3CGPC3IV-1-8 2 3CCV1 V-4 9 3CCV V-1 23 Total 100

EXAMPLE 2

The liquid crystal composition of Example 2 was prepared with thecompounds in percentages by weight shown in Table 4, filled between twosubstrates of a liquid crystal display, and subjected to performancetest. The test data is shown in the table below.

TABLE 4 Formulation of liquid crystal composition and performancestested Test result Code of Code of Percentage of performance componentstructure by weight parameters 3CCGF II-3 9 Cp 100.1 4CCGF II-4 8 Δ∈10.8 5CCGF II-5 5 Δn 0.107 2CCGF II-2 3 η 19 2CCPOCF3 III-2 6 VHR (100°C.) 96.2% 3CCPOCF3 III-3 9 VHR (UV) 96.0% 4CCPOCF3 III-4 4 3PGUQUF I-3 64PGUQUF I-4 7 5PGUQUF I-5 6 2PGUQUF I-2 4 3CPPC3 IV-1-3 1.5 3CPPC5IV-1-5 2 3CCEPC3 IV-2-3 3.5 3CCV1 V-4 5 3CCV V-1 16 7CPF VI-7 5 Total100

EXAMPLE 3

The liquid crystal composition of Example 3 was prepared with thecompounds in percentages by weight shown in Table 5, filled between twosubstrates of a liquid crystal display, and subjected to performancetest. The test data is shown in the table below.

TABLE 5 Formulation of liquid crystal composition and performancestested Code of Code of Percentage Test result of component structure byweight performance parameters 3CCGF II-3 4 Cp 95.9 4CCGF II-4 4 Δ∈ 10.75CCGF II-5 3 Δn 0.1 2CCGF II-2 2 η 22 2CCPOCF3 III-2 5 VHR (100° C.)96.2% 3CCPOCF3 III-3 3 VHR (UV) 96.8% 4CCPOCF3 III-4 5 3PGUQUF I-3 44PGUQUF I-4 3 5PGUQUF I-5 4 3CPPC3 IV-1-3 1.5 3CGPC3 IV-1-8 2 3CPPC5IV-1-5 2 3CCV1 V-4 11 3CCV V-1 19.5 3DPUF VII-2-3 4 4DPUF VII-2-4 53CDUF VII-1-3 9 5CDUF VII-1-5 9 Total 100

EXAMPLE 4

The liquid crystal composition of Example 4 was prepared with thecompounds in percentages by weight shown in Table 6, filled between twosubstrates of a liquid crystal display, and subjected to performancetest. The test data is shown in the table below.

TABLE 6 Formulation of liquid crystal composition and performancestested Code of Code of Percentage Test result of component structure byweight performance parameters 3CCGF II-3 9 Cp 109.4 4CCGF II-4 8 Δ∈ 10.55CCGF II-5 5 Δn 0.107 2CCGF II-2 3 η 22 2CCPOCF3 III-2 6 VHR (100° C.)96.3% 3CCPOCF3 III-3 9 VHR (UV) 96.0% 4CCPOCF3 III-4 4 5CCPOCF3 III-5 63PGUQUF I-3 5.5 4PGUQUF I-4 7 5PGUQUF I-5 5.5 2PGUQUF I-2 3.5 3CPPC3IV-1-3 1.5 3CPPC5 IV-1-5 2 3CCEPC3 IV-2-3 3.5 3CCEPC5 IV-2-5 1.5 4CCVV-2 5 5CCV V-3 5 3CCV V-1 10 Total 100

EXAMPLE 5

The liquid crystal composition of Example 5 was prepared with thecompounds in percentages by weight shown in Table 7, filled between twosubstrates of a liquid crystal display, and subjected to performancetest. The test data is shown in the table below.

TABLE 7 Formulation of liquid crystal composition and performancestested Code of Code of Percentage Test result of component structure byweight performance parameters 3CCGF II-3 6 Cp 100.2 4CCGF II-4 6 Δ∈ 10.15CCGF II-5 5 Δn 0.101 2CCGF II-2 4 η 20 2CCPOCF3 III-2 5 VHR (100° C.)96.2% 3CCPOCF3 III-3 3 VHR (UV) 96.5% 4CCPOCF3 III-4 5 5CCPOCF3 III-5 43PGUQUF I-3 5 4PGUQUF I-4 6 5PGUQUF I-5 6 3CPPC3 IV-1-3 1.5 3CGPC3IV-1-8 2 3CPPC5 IV-1-5 2 3CCV1 V-4 11 3CCV V-1 25.5 3CDUF VII-1-3 3Total 100

COMPARATIVE EXAMPLE 2

The liquid crystal composition of Example 1, prepared with the compoundsin percentages by weight shown in Table 3, was mixed with the compound3PUQUF in a ratio of 95:5, 90:10 and 85:15 to give the liquid crystalcompositions M1, M2 and M3 respectively. The liquid crystal compositionsM1, M2 and M3 were filled into two substrate of the liquid crystaldisplay device for performance test. The test data is shown in Table 7below:

TABLE 7 M1 M2 M3 VHR (100° C.) 96.5% 96.5% 96.5% VHR (UV) 93.3% 91.4%81.8%

It can be seen from the data in Table 7 that the VHR value of the liquidcrystal composition after UV irradiation decreases with increase in3PUQUF content, indicating that 3PUQUF can decrease the UV stability ofthe liquid crystal composition.

It can be known from the performance parameters of the liquid crystalcompositions shown in Comparative Example 1, Comparative Example 2 andExamples 1-5 that, the liquid crystal compositions of the presentinvention have a higher dielectric anisotropy, a suitable opticalanisotropy, a lower viscosity, good photostability and thermostability,and a higher clearing point, and are particularly suitable for use inliquid crystal display elements such as TFT driven by AM driving.

The above merely describes preferred embodiments of the presentinvention, and is not intended to limit the present invention in anyway. Although the present invention has been disclosed above withreference to the preferred embodiments, the present invention is notlimited thereto. Without departing from the scope of the technicalsolutions of the present invention, any person skilled in the art canmake variations or modifications to form equivalent embodimentsaccording to the technical content disclosed above. Any simplevariations, equivalent changes and modifications made to the foregoingembodiments according to the technical essence of the present inventionwithout departing from the content of the technical solutions of thepresent invention shall fall within the scope of the technical solutionsof the present invention.

1. A liquid crystal composition, comprising: 5-30% of one or morecompounds of general formula I based on a total weight of the liquidcrystal composition

1-30% of one or more compounds of general foimula II based on the totalweight of the liquid crystal composition

1-30% of one or more compounds of general foimula III based on the totalweight of the liquid crystal composition

1-20% of one or more compounds of general formula IV-1 and/or IV-2 basedon the total weight of the liquid crystal composition

and 15-50% of one or more compounds of general formula V based on thetotal weight of the liquid crystal composition

and the liquid crystal composition does not comprises a compound ofgeneral formula VIII:

wherein, R, R₁, R₂, R₃, R₄, R₅, R₆, R₇, and R₈ are the same or differentand are each independently selected from a halogenated ornon-halogenated alkyl or alkoxy group having 1 to 10 carbon atoms or ahalogenated or non-halogenated alkenyl or alkenyloxy group having 2 to10 carbon atoms; L₁ is —H, —F, —Cl, or —CH₃; Z₁ is a single bond, —COO—,or —OCO—; X₁ is —H or —CH₃.
 2. The liquid crystal composition accordingto claim 1, further comprising: one or more compounds of general formulaVI, wherein an amount of the one or more compounds of general formula VIbased on the total weight of the liquid crystal composition is greaterthan 0% and less than or equal to 10%,

wherein, R₉ is selected from an alkyl or alkoxy group having 1 to 10carbon atoms or an alkenyl or alkenyloxy group having 2 to 10 carbonatoms; X₂ is selected from —F, —OCF₃, an alkyl or alkoxy group having 1to 5 carbon atoms, or an alkenyl or alkenyloxy group having 2 to 6carbon atoms; ring

is


3. The liquid crystal composition according to claim 2, furthercomprising: one or more compounds of general formula VII, wherein anamount of the one or more compounds of general formula VII based on thetotal weight of the liquid crystal composition is greater than 0% andless than or equal to 30%,

wherein, R₁₀ is selected from an alkyl or alkoxy group having 1 to 10carbon atoms or an alkenyl or alkenyloxy group having 2 to 10 carbonatoms; ring

and ring

are the same or different and are each independently selected from


4. The liquid crystal composition according to claim 1, wherein thecompound of general formula I is selected from compounds I-1 to I-5:


5. The liquid crystal composition according to claim 1, wherein thecompound of general formula II is selected from compounds II-1 to II-5:


6. The liquid crystal composition according to claim 1, wherein thecompound of general formula III is selected from compounds III-1 toIII-5:


7. The liquid crystal composition according to claim 1, wherein thecompound of general formula N-1 is selected from compounds IV-1-1 toIV-1-10:

the compound of general formula IV-2 is selected from compounds IV-2-1to IV-2-10:


8. The liquid crystal composition according to claim 1, wherein thecompound of general formula V is selected from compounds V-1 to V-6:


9. The liquid crystal composition according to claim 2, wherein thecompound of general formula VI is selected from compounds VI-1 to VI-10:


10. The liquid crystal composition according to claim 3, wherein thecompound of general formula VII is selected from compounds of generalformulas VII-1 to VII-2:

wherein, R₁₀ is selected from an alkyl or alkoxy group having 1 to 5carbon atoms or an alkenyl or alkenyloxy group having 2 to 6 carbonatoms.
 11. The liquid crystal composition according to claim 10, whereinthe compound of general formula VII-1 is selected from compounds VII-1-1to VII-1-5:

the compound of general formula VII-2 is selected from compounds VII-2-1to VII-2-5:


12. The liquid crystal composition according to claim 1, wherein theliquid crystal composition comprises: 8% of the compound II-3 based onthe total weight of the liquid crystal composition

7% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

1% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6.5% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

7% of the compound I-5 based on the total weight of the liquid crystalcomposition

4% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

9% of the compound V-4 based on the total weight of the liquid crystalcomposition

and 23% of the compound V-1 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 9% of the compound II-3based on the total weight of the liquid crystal composition

8% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

3% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-5 based on the total weight of the liquid crystalcomposition

4% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

3.5% of the compound IV-2-3 based on the total weight of the liquidcrystal composition

5% of the compound V-4 based on the total weight of the liquid crystalcomposition

16% of the compound V-1 based on the total weight of the liquid crystalcomposition

and 5% of the compound VI-7 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 4% of the compound II-3based on the total weight of the liquid crystal composition

4% of the compound II-4 based on the total weight of the liquid crystalcomposition

3% of the compound II-5 based on the total weight of the liquid crystalcomposition

2% of the compound II-2 based on the total weight of the liquid crystalcomposition

5% of the compound III-2 based on the total weight of the liquid crystalcomposition

3% of the compound III-3 based on the total weight of the liquid crystalcomposition

5% of the compound III-4 based on the total weight of the liquid crystalcomposition

4% of the compound I-3 based on the total weight of the liquid crystalcomposition

3% of the compound I-4 based on the total weight of the liquid crystalcomposition

4% of the compound I-5 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

11% of the compound V-4 based on the total weight of the liquid crystalcomposition

19.5% of the compound V-1 based on the total weight of the liquidcrystal composition

4% of the compound VII-2-3 based on the total weight of the liquidcrystal composition

5% of the compound VII-2-4 based on the total weight of the liquidcrystal composition

9% of the compound VII-1-3 based on the total weight of the liquidcrystal composition

and 9% of the compound VII-1-5 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 9% of the compound II-3based on the total weight of the liquid crystal composition

8% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

3% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6% of the compound III-5 based on the total weight of the liquid crystalcomposition

5.5% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

5.5% of the compound I-5 based on the total weight of the liquid crystalcomposition

3.5% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

3.5% of the compound IV-2-3 based on the total weight of the liquidcrystal composition

1.5% of the compound IV-2-5 based on the total weight of the liquidcrystal composition

5% of the compound V-2 based on the total weight of the liquid crystalcomposition

5% of the compound V-3 based on the total weight of the liquid crystalcomposition

and 10% of the compound V-1 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 6% of the compound II-3based on the total weight of the liquid crystal composition

6% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

4% of the compound II-2 based on the total weight of the liquid crystalcomposition

5% of the compound III-2 based on the total weight of the liquid crystalcomposition

3% of the compound III-3 based on the total weight of the liquid crystalcomposition

5% of the compound III-4 based on the total weight of the liquid crystalcomposition

4% of the compound III-5 based on the total weight of the liquid crystalcomposition

5% of the compound I-3 based on the total weight of the liquid crystalcomposition

6% of the compound I-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-5 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

11% of the compound V-4 based on the total weight of the liquid crystalcomposition

25.5% of the compound V-1 based on the total weight of the liquidcrystal composition

and 3% of the compound VII-1-3 based on the total weight of the liquidcrystal composition


13. (canceled)
 14. A liquid crystal display element, comprising theliquid crystal composition of claim
 1. 15. The liquid crystalcomposition according to claim 2, wherein the liquid crystal compositioncomprises: 8% of the compound II-3 based on the total weight of theliquid crystal composition

7% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

1% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6.5% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

7% of the compound I-5 based on the total weight of the liquid crystalcomposition

4% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

9% of the compound V-4 based on the total weight of the liquid crystalcomposition

and 23% of the compound V-1 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 9% of the compound II-3based on the total weight of the liquid crystal composition

8% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

3% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-5 based on the total weight of the liquid crystalcomposition

4% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

3.5% of the compound IV-2-3 based on the total weight of the liquidcrystal composition

5% of the compound V-4 based on the total weight of the liquid crystalcomposition

16% of the compound V-1 based on the total weight of the liquid crystalcomposition

and 5% of the compound VI-7 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 4% of the compound II-3based on the total weight of the liquid crystal composition

4% of the compound II-4 based on the total weight of the liquid crystalcomposition

3% of the compound II-5 based on the total weight of the liquid crystalcomposition

2% of the compound II-2 based on the total weight of the liquid crystalcomposition

5% of the compound III-2 based on the total weight of the liquid crystalcomposition

3% of the compound III-3 based on the total weight of the liquid crystalcomposition

5% of the compound III-4 based on the total weight of the liquid crystalcomposition

4% of the compound I-3 based on the total weight of the liquid crystalcomposition

3% of the compound I-4 based on the total weight of the liquid crystalcomposition

4% of the compound I-5 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

11% of the compound V-4 based on the total weight of the liquid crystalcomposition

19.5% of the compound V-1 based on the total weight of the liquidcrystal composition

4% of the compound VII-2-3 based on the total weight of the liquidcrystal composition

5% of the compound VII-2-4 based on the total weight of the liquidcrystal composition

9% of the compound VII-1-3 based on the total weight of the liquidcrystal composition

and 9% of the compound VII-1-5 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 9% of the compound II-3based on the total weight of the liquid crystal composition

8% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

3% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6% of the compound III-5 based on the total weight of the liquid crystalcomposition

5.5% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

5.5% of the compound I-5 based on the total weight of the liquid crystalcomposition

3.5% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

3.5% of the compound IV-2-3 based on the total weight of the liquidcrystal composition

1.5% of the compound IV-2-5 based on the total weight of the liquidcrystal composition

5% of the compound V-2 based on the total weight of the liquid crystalcomposition

5% of the compound V-3 based on the total weight of the liquid crystalcomposition

and 10% of the compound V-1 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 6% of the compound II-3based on the total weight of the liquid crystal composition

6% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

4% of the compound II-2 based on the total weight of the liquid crystalcomposition

5% of the compound III-2 based on the total weight of the liquid crystalcomposition

3% of the compound III-3 based on the total weight of the liquid crystalcomposition

5% of the compound III-4 based on the total weight of the liquid crystalcomposition

4% of the compound III-5 based on the total weight of the liquid crystalcomposition

5% of the compound I-3 based on the total weight of the liquid crystalcomposition

6% of the compound I-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-5 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

11% of the compound V-4 based on the total weight of the liquid crystalcomposition

25.5% of the compound V-1 based on the total weight of the liquidcrystal composition

and 3% of the compound VII-1-3 based on the total weight of the liquidcrystal composition


16. The liquid crystal composition according to claim 3, wherein theliquid crystal composition comprises: 8% of the compound II-3 based onthe total weight of the liquid crystal composition

7% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

1% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6.5% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

7% of the compound I-5 based on the total weight of the liquid crystalcomposition

4% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

9% of the compound V-4 based on the total weight of the liquid crystalcomposition

and 23% of the compound V-1 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 9% of the compound II-3based on the total weight of the liquid crystal composition

8% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

3% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-5 based on the total weight of the liquid crystalcomposition

4% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

3.5% of the compound IV-2-3 based on the total weight of the liquidcrystal composition

5% of the compound V-4 based on the total weight of the liquid crystalcomposition

16% of the compound V-1 based on the total weight of the liquid crystalcomposition

and 5% of the compound VI-7 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 4% of the compound II-3based on the total weight of the liquid crystal composition

4% of the compound II-4 based on the total weight of the liquid crystalcomposition

3% of the compound II-5 based on the total weight of the liquid crystalcomposition

2% of the compound II-2 based on the total weight of the liquid crystalcomposition

5% of the compound III-2 based on the total weight of the liquid crystalcomposition

3% of the compound III-3 based on the total weight of the liquid crystalcomposition

5% of the compound III-4 based on the total weight of the liquid crystalcomposition

4% of the compound I-3 based on the total weight of the liquid crystalcomposition

3% of the compound I-4 based on the total weight of the liquid crystalcomposition

4% of the compound I-5 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

11% of the compound V-4 based on the total weight of the liquid crystalcomposition

19.5% of the compound V-1 based on the total weight of the liquidcrystal composition

4% of the compound VII-2-3 based on the total weight of the liquidcrystal composition

5% of the compound VII-2-4 based on the total weight of the liquidcrystal composition

9% of the compound VII-1-3 based on the total weight of the liquidcrystal composition

and 9% of the compound VII-1-5 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 9% of the compound II-3based on the total weight of the liquid crystal composition

8% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

3% of the compound II-2 based on the total weight of the liquid crystalcomposition

6% of the compound III-2 based on the total weight of the liquid crystalcomposition

9% of the compound III-3 based on the total weight of the liquid crystalcomposition

4% of the compound III-4 based on the total weight of the liquid crystalcomposition

6% of the compound III-5 based on the total weight of the liquid crystalcomposition

5.5% of the compound I-3 based on the total weight of the liquid crystalcomposition

7% of the compound I-4 based on the total weight of the liquid crystalcomposition

5.5% of the compound I-5 based on the total weight of the liquid crystalcomposition

3.5% of the compound I-2 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

3.5% of the compound IV-2-3 based on the total weight of the liquidcrystal composition

1.5% of the compound IV-2-5 based on the total weight of the liquidcrystal composition

5% of the compound V-2 based on the total weight of the liquid crystalcomposition

5% of the compound V-3 based on the total weight of the liquid crystalcomposition

and 10% of the compound V-1 based on the total weight of the liquidcrystal composition

or the liquid crystal composition comprises: 6% of the compound II-3based on the total weight of the liquid crystal composition

6% of the compound II-4 based on the total weight of the liquid crystalcomposition

5% of the compound II-5 based on the total weight of the liquid crystalcomposition

4% of the compound II-2 based on the total weight of the liquid crystalcomposition

5% of the compound III-2 based on the total weight of the liquid crystalcomposition

3% of the compound III-3 based on the total weight of the liquid crystalcomposition

5% of the compound III-4 based on the total weight of the liquid crystalcomposition

4% of the compound III-5 based on the total weight of the liquid crystalcomposition

5% of the compound I-3 based on the total weight of the liquid crystalcomposition

6% of the compound I-4 based on the total weight of the liquid crystalcomposition

6% of the compound I-5 based on the total weight of the liquid crystalcomposition

1.5% of the compound IV-1-3 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-8 based on the total weight of the liquidcrystal composition

2% of the compound IV-1-5 based on the total weight of the liquidcrystal composition

11% of the compound V-4 based on the total weight of the liquid crystalcomposition

25.5% of the compound V-1 based on the total weight of the liquidcrystal composition

and 3% of the compound VII-1-3 based on the total weight of the liquidcrystal composition


17. A liquid crystal display element, comprising the liquid crystalcomposition of claim
 2. 18. A liquid crystal display element, comprisingthe liquid crystal composition of claim
 3. 19. A liquid crystal displayelement, comprising the liquid crystal composition of claim
 12. 20.(canceled)